netdev - [PATCH] isdn: mISDN: Fix potential NULL pointer dereference of kzalloc

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Message-Id: <20190302212044.13638-1-pakki001@umn.edu>
Date:   Sat,  2 Mar 2019 15:20:43 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Karsten Keil <isdn@...ux-pingi.de>,
        "David S. Miller" <davem@...emloft.net>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] isdn: mISDN: Fix potential NULL pointer dereference of kzalloc

Allocating memory via kzalloc for phi may fail and causes a
NULL pointer dereference. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/isdn/hardware/mISDN/hfcsusb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index 124ff530da82..26e3182bbca8 100644
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -263,6 +263,9 @@ hfcsusb_ph_info(struct hfcsusb *hw)
 	int i;
 
 	phi = kzalloc(struct_size(phi, bch, dch->dev.nrbchan), GFP_ATOMIC);
+	if (!phi)
+		return;
+
 	phi->dch.ch.protocol = hw->protocol;
 	phi->dch.ch.Flags = dch->Flags;
 	phi->dch.state = dch->state;
-- 
2.17.1